You can find out if a member is still on the forum by going to his/her profile and clicking on Statistics. That will show what they've posted, which threads they started, and the last date and time of activity here. If they are on the forum right now it will tell you what they are looking at (as in you Tom checking the woman's hands thread at 9:55. That almost seems like an invasion of privacy but it's all there.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.